docs: def destroy(self, subid, ipaddr, params=None):
          ''' /v1/server/destroy_ipv4
          POST - account
          Removes a secondary IPv4 address from a server. Your server will be
          hard-restarted. We suggest halting the machine gracefully before
          removing IPs.
  
          Link: https://www.vultr.com/api/#server_destroy_ipv4
          '''
          params = update_params(params, {
              'SUBID': subid,
              'ip': ipaddr
          })
          return self.request('/v1/server/destroy_ipv4', params, 'POST')